duty. >> the prime minister will be aware that the mayor of london, boris johnson, proposes to close nearly every single ticket office on the london underground network, with more than 700 jobs being lost. does the prime minister believe that that is the way to raise living standards for ordinary londoners? >> the best way to help londoners is to ensure that we have a safe and affordable tube, and that we use modern technology to deliver that. the conversation that the hon. lady needs to have is with the trade union that has done so much damage to our underground. we ought to have no-strike deals on the underground and permanent systems that provide a good service. >> earlier this week in brighton, i was tested for hiv. this sunday is world aids day. in view of the fact that one in five people with hiv in this country does not know that they have it, does the prime minister agree that regular testing is to be encouraged? >> i pay tribute to my hon. friend, all hon. members across the house and everyone in politics who campaign so persistently and consistently on this issue.